How do contact forces such as friction differ from gravitational and magnetic forces?

Answers

Answer 1

Answer: "Contact" means "touching". A contact force can't act on an object unless
they're touching. Friction is a contact force.

Gravitational forces pull masses together even if they're not touching.
Magnetic forces pull a piece of iron toward a magnet even if they're not touching.

Gravitational and magnetic forces are "non-contact" forces.

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How do you find density?

Answers

density = mass / volume

*mass must be in grams and volume must be in liters

With mass and volume!! Hope this helped!!

Contrast the movement of charges in a series circuit and in a parallel circuit.

Answers

In a series circuit, there is only one possible path from one battery
terminal, through the circuit, to the other battery terminal. All of the
current that leaves one side of the battery travels exactly the same
path to the other side of the battery. There's never any point in the
circuit where the current has a choice of which way to go.

In a parallel circuit, there are different possible paths. On its way
through the circuit, the current comes to a point where it has a
choice of going this way or that way. What happens at that point
is that the current splits up ... part of it goes this way, and the rest
of it goes that way, and it all joins up together again somewhere
else in the circuit.

Identify each wave interaction based on how it changes direction. The wave changes direction as it bends and scatters. _______

The wave changes direction as it changes its speed. _______

The wave changes direction at an angle equal to the angle of incidence. ________
diffraction
reflection
refraction

PLEASE HELP!!

Answers

Answer:

Here is the answer.

Explanation:

The answers are:

1. Diffraction

2. Refraction

3. Reflection

Hope this helps!

How is the motion of P waves different from the motion of S waves?

Answers

S waves travel slower than P waves.

Oceans receive freshwater from precipitation and rivers. Yet ocean levels do not change very much from these actions. Why are ocean levels not greatly affected?

Answers

Ocean levels are not greatly affected because when water is deposited or received from the ocean, at the same time water is being evaporated from the ocean to condense in the clouds and them form into precipitation.

Two reasons:

1). Because oceans are big and deep, and have a lot of water in them,
while by comparison, rivers are narrow, shallow, and carry less water.
It's like using a hundred droppers to pour water into an olympic-size pool.
The level of the water in the pool doesn't change much.

2). Because the sun shines on oceans, and tons of water evaporates
from them. That's where the water comes from to make rain and snow,
and to keep the rivers full, so that they can keep flowing into oceans.
It's a cycle. The same water flows into the oceans from the rivers,
then evaporates from the oceans, fills the rivers, and flows into the
oceans again . . . millions of times.

How do whales bats and dolphins use echolocation?A To scare away predators
B To attract mates
C To orient them selves and find food
D To tell animals of there species where they are

Answers

C is your answer ithink

I think ur answer is c

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